The Siralim games are some that capture some of what Pokemon is for mobile (although the controls aren't really optimised for touch with on-screen D-pad and virtual A/B buttons), although I suppose it's more like some of the old Monster Hunter games (capture, breeding as well as a bunch of other mechanics too).

Have you tried using emulator for that? I've tried and don't like the touch control (physical joystick has better feel). And playing on phone can easily be interrupted, notif or calls for example.

Then imo people don't want to spend 50$ because switch > mobile for gaming.