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If you want to make a real fangame (like Undertale Yellow or Unitale battles) on your phone, you need a game engine. The best engine for Undertale clones on Android is (LÖVE).
If you are looking to build a full standalone game from scratch with more complex mechanics, you may want to use professional game engines on a PC and export them to Android: BattleTale:Boss Battles&Maker - Apps on Google Play undertale battle maker android
Are you looking to or are you more interested in playing fan-made AUs ? BattleTale:Boss Battles&Maker - Apps on Google Play If you want to make a real fangame
Undertale Battle Maker (UBM) for Android is a fan-made game creation tool inspired by Undertale’s battle system. This handbook covers installation, interface, mechanics, assets, scripting, designing encounters, optimization, distribution, troubleshooting, and legal/ethical considerations to help you build polished, playable battles and mini-games on Android. playable battles and mini-games on Android.
