I was under the impression the rain was more a way to fill Grimer's new pond.
The fighting was over after the water was cleared, which resulted in the Rock Pokémon being able to go back to their territory. The reason of the fight was because they wanted to move to the territory of the other...
I like this kind of episodes (although sometimes it seems like this isn't a popular opinion ;) ).
Grimer has every right to take a relaxing bath ofcourse. Again a little problem you would have in real life if you let all those different Pokémon life together in a closed biotope. Great it now...
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