Oh no. It's an abuse of mechanics to have anyone at any level help a friend. It's been around since day one. Blu is the only one with boosted EXP for overworld mobs. It's not hard to level without a friend helping you. This thread sounds pretty 'I made a decision so what I said is 100% true' honestly.
Guess I better report my FC members for helping me level at any point when we weren't in a party, I'll go get the manager. /joke