Hmm, well I guess I'm not a spriter/graphics artist so I dunno, they don't seem to clash to me, anyway.
A little bit brighter still, I'd say. And while you're at it, see the outline-colour of the PokéCenter, PokéMart and Gym tiles? Make that a bit darker, to make it stand out more. That way, it's more similar to the house tiles and well tiles you've used, so it's more consistent (ie. not-clashing).
If you're mixing tiles made by different people/based on different games, you'll need to do a bit of editing yourself. For the most part the tiles you've selected at least look proportionate to one another (by Pokémon standards), it's just things like outlines and stuff you'd need to worry about: that's my stance on the matter!