Rate my Rain Team

[Arctero]

I would suggest another form of speed control outside of rain, such as tailwind. There are a good amount of teams that are prepared to deal with rain and immediately change the weather, so having another way to outspeed/underspeed your opponent will be very useful. I am also wondering about dragonium z over waterium z since fairies exist in the meta and are immune to devastating drake. instead of draco meteor, you could go ice beam and possibly icium z since they cover the same types and you have a solid attack for any form of landorus (scarf, AV, etc.). One threat that easily comes to mind is Tapu Lele since there aren't many pokemon on your team that are purely invested in defense/special defense and it can easily spam psychic or a coverage move and take down several members of your team.

Overall it seems really solid, you just need to test the team out and see how it handles the meta yourself and adjust the team according to your playstyle.

I would also suggest adding in the remaining 4 EVs to all of your pokemon as it can make a difference with rolls, or you can mess around and create a custom set that still gets KOs or lives hits from certain threats.

Anyways, it looks like a really good team! Good luck on the ladder.