This is how to develop in G Generation Eternal and recommended units (mechs). Information on recommended development paths and materials for G Generation Eternal development is provided. Please use this for your development.
Table of Contents
How to Develop
Development can be done from 'Menu' → 'Develop'

Development is possible by tapping 'Develop' from the bottom menu and selecting the relevant series or unit. On the screen, the development path for each series is displayed, and you can check which units can be developed from which.
Acquire New Units by Consuming Materials and Capital

Development requires the material unit to reach a specified level, necessary material items for development, and capital. The material unit disappears upon completion of development, but the new unit joins by inheriting a portion of its level.
Development Paths Differ for Each Series

In G Generation Eternal, development paths are divided by series. Furthermore, multiple development paths are available even within a single series, so be careful not to miss them.
Benefits of Development
Earn Rewards Based on Registration Status

As you complete development paths, you can earn rewards such as 'Enhancement Materials,' 'SP Conversion Chips,' and 'SSR Units' based on the registration percentage. Rewards are set for each tree.
Developed Units Can Be Used as Immediate Combat Power

Units after development can be immediately organized into squads, leading to strengthening combat power and expanding development paths. By utilizing limit breaks, they can also become units that can be active long-term.
Recommended Units for Development
Basically, Develop According to Progress

Basically, let's proceed with developing series according to stage progression. It is recommended to develop unacquired units in order, as there are rewards based on registration status.
Can Be Active in Series Formations
If you proceed with development simultaneously with main stage progression, they can be used in series formation slots and thus be active.
Prioritize Development with SSR Units as Rewards

Let's prioritize development where SSR units are offered as rewards. The 'Mobile Suit Gundam [Zeon],' 'Mobile Suit Z Gundam A New Translation,' 'Mobile Suit Gundam ZZ [Neo Zeon],' and 'Gundam W' series offer SSR units as rewards, so you can quickly strengthen your forces.
Development Possible at Lower Cost by Using Captured Units

For units requiring multiple bodies for development, you can proceed with development at a lower cost by utilizing captures. Excess units from captures can also be dismantled into materials like capital, so let's also utilize captures when proceeding with development.