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Knowing what to upgrade first in your mobile suit in Gundam UCE is important, as upgrading can take many resources. Read on to learn what to prioritize, such as Custom Up, Transcendence, Potential Unleashed, and other methods.
List of Contents
| Priority | Upgrade | Importance |
| 1 | Custom Up | ★★★★★ |
| 2 | Transcendence | ★★★★★ |
| 3 | Sub Mobile Suits | ★★★★☆ |
| 4 | Grade Up | ★★★★☆ |
| 5 | Potential Unleashed | ★★★★☆ |
| 6 | Modules | ★★★☆☆ |
| 7 | Unit Enhancement | ★★★☆☆ |
| 8 | Skill Rate Up | ★★☆☆☆ |
| 9 | Engage Link | ★☆☆☆☆ |

Raising your Mobile Suit's custom level unlocks and improves the capabilities of your MS' skill 1 and skill 2, as well as improves its stats and unlocks module slots. It's important that you prioritize getting your MSs to at least Custom Lv. 4, as this unlocks both their skills. However, it's ideal to keep increasing your custom level whenever you can, as your mobile suit will benefit greatly from their leveled-up skill 1 and 2, as well as their improved stats and module slots.
Your maximum custom level is tied to your Player Rank, which automatically increases the more you play the game. You'll need alteration materials or custom tickets to increase the custom level. Luckily, these aren't as hard to accumulate as the Rainbow Haro coins or MS blueprints.
How to Custom Up? Unit Alteration Guide

Transcending your mobile suit should be your top priority, especially if the said mobile suit is a key unit in your team. This is because a lot of the skills that make a unit strong are Transcendent Skills that are locked behind Transcendence levels.
For example, the S Gundam receives a 25% accuracy buff and a 36% increase in critical ATK when transcended fully, as well as starting the battle with its EX gauge already half full. These buffs help make the S Gundam better at its job as a backline DPS threat. Starting a battle with the EX gauge halfway drastically improves the mobile suit, as the S Gundam enjoys a massive critical rate buff of 50% whenever it activates its EX Skill. Having this MS transcended fully will mean that it can activate this buff much earlier in the battle.
The catch with Transcending is that it requires Rainbow Haro coins, which can be extremely hard to get in the game, often requiring you to set up a Haro Farm to be able to reliably earn these. Because of this, only Transcend units that you think will be a mainstay in your team.
How to Transcend Your Mobile Suits? Transcendence Guide

Sub Mobile Suits are units that assist your main party members by giving them a percentage of their stats, as well as a set of Sub Skills that are unique to them.
Sub Mobile Suits can only be equipped on units of the same type. They grant twice the amount of stats if the mobile suit they are assisting is of the same category. To maximize the Sub MS' stat boost values, you'll want them at high Custom Level and Skill Rate Level.
Their Sub Skills are dependent on how high the Sub MS's potential Level is. Potential Lv. 0 Sub MSs don't grant any Sub Skills at all, while Potential Lv. 5 MSs grant the full strength of Sub Skills.
That being said, it is important to not only upgrade the mobile suits of your party, but their Sub MSs as well.

Grade Up is Gundam UCE's newest upgrade system. Grading Up not only increases a mobile suit's stats, but also gives it a set of buffs called Grade Skills. Both the stat buffs and Grade Skills vary depending on the mobile suit's category.
Grade Up requires Gears to perform, which come in different rarities and categories. For example, to Grade Up a UR Armored unit, you specifically need UR Armored Gears. These Gears can only be earned from events or purchased from Grade Up packs in the Gundam UCE Diamond Shop.
Grading Up a mobile suit makes them significantly stronger, especially in PvE, where Grade II units deal 2,000% more skill damage and get a 20,000,000 damage cap increase for skills, on top of their respective Grade Skills.
Because of how difficult it is to earn Gears, you might want to save them for only your finest mobile suits.
How To Get Gears? Grade Up Guide

Unleashing your mobile suit's potential should be your next priority after transcending, as this improves all of the effects of your suit's EX Skill. It will increase the damage you'll deal with it, as well as improve the buff percentages you receive and the duration of your debuffs/buffs if applicable.
For example, the Hamma-Hamma's known for its high damage against stunned targets, and the stun it inflicts against opponents with the Unavoidable status effect. Unleashing its potential allows the Hamma-Hamma to immobilize foes with its stun for a longer duration, as well as increases the damage it deals both at base and against stunned opponents.
Like Transcending, unleashing your suit's potential is rather difficult, as this requires you to get blueprints of the mobile suit you wish to upgrade. You'll have to pull multiple copies of the mobile suit to unleash its maximum potential. Some blueprints are available in the shop, while some can be earned through Fragment Quests.
How to Raise Potential? Potential Unleashed Guide

Modules are items that mobile suits can equip to boost certain stats and substats. These can be earned from Cooperative Battles and Raid Battles, or bought in the Recycle Shop and certain Event Shops.
Modules come in different forms and are categorized by type. Mobile suits can only equip modules of the same type and color, and each form upgrades a certain stat. The substats that stronger modules come with are randomized and are not tied to any form of module.

Unit Enhancement grants your units significant boosts to the MS' base HP, ATK, Accuracy, or Evasion, and each weapon's Power, Accuracy, and EX gauge recovery. While it's not as important as the others, a high Unit Enhancement level is usually what separates the best versions of a unit from the average.
To add points into your mobile suit's Unit Enhancement Point allocation, you have to spend Body or Weapon Chips depending on the upgrade, and you'll need to spend Unit Enhancement Pts. as well.
How to Enhance Units? Unit Enhancement Guide

Skill Rate Up is yet another way to strengthen your mobile suit. Unlike the other upgrade systems discussed above, this one is not tied to any skill upgrades. Instead, it boosts your MS's CP, HP, ATK, and DEF. A mobile suit's Skill Rate is the easiest to level up, as it automatically does so incrementally with every battle you do. Alternatively, you could increase your MS' Skill Rate by using Skill Rate Data discs, and odds are you have tons of these lying around in your inventory. You could also buy them from the shop if you don't happen to have any.

Engage Link offers another way of boosting your units' stats. Contrary to other upgrade systems, this is almost passive, as you only have to collect different Mobile Suits to increase the Engage Link level. Each Mobile Suit belongs to a specific "Record," and each level boosts one stat—either ATK, DEF, HP, Projectile, or Beam damage—of all units you own under that category. Pull units from the gacha banner or buy and complete quests that award blueprints to assemble new Mobile Suits.

What Upgrade Should I Do First?

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