Pokémon Platinum

My favorite main series Pokémon game. 

This game started off as a super fun RPG that I loved however I am at the 65 hour mark and finding it next to impossible to beat the elite four with the only way to fix this being grinding, which is what I've done for the last 65 hours. Great game ruined by difficult ending and a lack of a way to combat this other than retracing your steps.