[Ah.. he remembers Apollo from that time in Ilex Forest. That seems like such a long time ago.

He doesn't know much about Gym battling, but he has a few things he's kept in mind, just in case.]

I think the key to an easier win is to focus on type advantages. There are plenty of sources to find out what types the leaders use, so using that information should help you train a Pokémon suited for the battles. It should go easier after that.