dont get sued bro
Bruh, even Nintendo doesn't bother going after Pokemon fan games 99% of the time and even in those few rare cases when they have done so they start with cease&desist instead of lawsuit, like pretty much every other gaming company that feels the need to protect their IP. Even they realize that bullying fan games generally causes more harm than good for them as it just alienates the most dedicated fans.
I don't think it's impossible that this game receives it's own c&d one day, but no way Bandai is gonna sue the dev