No level up

[TheWarley]

Guys, is there any item that, when insured, prevents a pokemon from leveling up or gaining experience? And if so, could you tell me where and how I would get it?

[Akshit]

1 hour ago, TheWarley said:

Guys, is there any item that, when insured, prevents a pokemon from leveling up or gaining experience? And if so, could you tell me where and how I would get it?

Amnesia Brace, 1,000 RP item in Gift Shop

It's untradeable so if you wish to purchase one without using irl money, buy a 1k RP Voucher in-game through pokeyen. 

The item holder will get no Exp and retain full EVs. But the EVs are not transferred the way Exp share transfers them so the pokémon holding it will have to be in battle.

[Oldenman]

If the thing you are worrying about is the LV cap, the game won't let you go over. It will store exp until your next gym battle