Is there any other way to grind EXP?

At the moment I've been doing the Alpha Blissey part of the game but since I've been on and off the game because of Legends ZA and SV, I want to know if there are any other methods to grind EXP?

I have not unlocked Ingo yet, afaik he's in the mid-late game.

I just find the Grind to be extremely difficult and can't catch the Alpha Pokemon as of yet.