Question

my pokemon is not gaining any exp
it is still lv 5 after i hv battled so many trainers, upto trainer n in accumula town

Answer 1

You're playing a secured copy of the game that has a protection script running in it to prevent you from gaining experience, and therefore, not playing through the game.

You're either:

• Playing a game copy on a DS that aren't from the same region.

or

• Playing via ROM on an emulator.

Someone may've bugged out a copy and modded it just to screw with the players, as well. Either way, it's a security script, and likely won't be fixed.