After finishing the game the only thing I ever did whenever I picked it up was fight thunder skeleton dude over and over and over and over and over and

Yeah, Crown Thunder is a real pain, especially if you're playing Ice Pegasus version.  You want to get as many Wood Battle Cards as you can--I recommend Vulcan Seed, it's multi-hit and covers basically the entire field.

Saw this blog title.

Obligatory:

Carry on.