Answer 1

1. Get a Level 100 and give the weak Pokemon EXP Share.

2. Send out the weak Pokemon first, then switch to a Level 100 and deafefat the opponent. Theweak Pokemon gets all the EXP.

(Note: For 2, only if you do not have EXP Share.)

Comments

Good ideas.

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You could give the weak Pokemon a Lucky Egg on #2