I recently did a mono grass run of Violet because I needed one more copy of Miraidon, Iron Boulder and Iron Crown. gotta say, the first couple of gyms were hard af.
ended up with Meowscarada, Alolan Exxegutor, Sinischa, Mow Rotom, Breloom and Vileplume after all was said and done.
currently waiting for my turn in Master Duel.