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Honestly the second I remembered that Bellsprout evolved at 21 was the second that Misty was done for, set up some Growths on her Staryu and dished out two swift OHKOs with Vine Whip. FigTreeBel got so much EXP during it that she gained an entire level, Medium Slow remains the best EXP group by far for in-game!
The overpreparation of everyone else should at the very least reduce some of the risk going forward, Raticate especially (Rattata is just so frail).