I don't know if this is reported, I do just in case. Last post about this I could find was Oct 2015

Regenerator WORKS but it has a bug: when you withdraw the Pokémon won't recover the HP until he/she battle again. Sometimes if you withdraw the Pokémon and finish the battle with another Pokémon (if the Pokémon with Regenerator recover all the HP) will appear a visual bug on the HUD, the Pokémon has the HP bar not full but HP is really full.

 

An example. In many of cases, maybe all, this happen when you Run away (from the battle)

(I can't give Potion because the HP is full, but you can see the visual bug)

 

Edit: I just realized another bug, I'll try to explain. If you withdraw the Pokémon with Regenerator and Run away with another Pokémon, he/she will recover the HP in the first turn in the next battle.

 

I guess the solution for the 3 bugs should be that the Pokémon recover the HP in the moment he/she is withdraw.

 

Sorry for my English, is too hard explain this for me :confused:

I have just made a demo video