Everyone seems equally useful, so I'm not too sure on who to use. Should I focus on 3 members exclusively, or should I focus on everyone equally? Also do people not in my party still get experience? --- I'm just dickin aroouunnnd SHAKE AND BAKE!
Everyone equally. My party consisted of whoever had lowest level.
And no, they don't get any experience if they're not in your party. They'll level really fast in new dungeon tho.
I find the most efficiant party for end game is yukiko/teddie/yosuke however the game is not too hard to the point where it matters just use who you like I found myself playing solo more often than with a party by the time I reached heaven showing If I can go solo than the 3 others are not make or breaks