>>23494786
This is how 30 (and V and X) do characters under the hood. Example is Shin Getter Dragon in 30
You can add as many extra "entries" and fill them with proper robot and pilots ids, hypotetically making anything that is already programmed in the game playable
If Y uses a similar system (the dialogue files are unchanged from 30 so it's possible the deploy tables are unchanged too) then just edit those and you can have any character in the game in your party