Which Pokémon would benefit the most from the Rainbow created by Fire Pledge and Water Pledge?

Question

In case you didn't know, when you use Fire Pledge and Water Pledge in the same turn, it creates a Rainbow, which pretty much gives all your Pokémon Serene Grace for 4 turns. This stacks with normal Serene Grace, except for with flinching, because 100% flinch chance would be OP.

I'm wanting to make a Gen 9 Natdex doubles team built around this unique mechanic, but I really don't know much about what Pokémon are viable in doubles, or which would benefit from the Rainbow the most. What I want is a list of Pokémon which are viable in Gen 9 Natdex doubles, and would benefit greatly from having the secondary effects of all their moves doubled. Thanks for your help!

Comments

Now I'm no Doubles player, but this strategy sounds a bit too gimmicky to have proper competitive viable use imo.

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https://www.smogon.com/forums/threads/national-dex-doubles-viability-rankings.3757433/
Those viability rankings were last edited a month ago, so they should be pretty accurate. If you're aware that the Pledges are a gimmick, that's fine — but don't expect to win consistently. The only Pokemon that can learn Fire Pledge on these rankings are Mega Charizard Y and Incineroar; Water Pledge's only representative is Blastoise. All of these Pokemon have more valuable options for their limited moveslots.

If you do it anyway... I'm not seeing much that would benefit at first glance. Maybe Flutter Mane for Moonblast/Shadow Ball drops? Or Diancie for the guaranteed Defense boost from Diamond Storm? Or Tapu Fini for the Muddy Water accuracy drop?

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I always wanted to try this:

turn 1, inteleon uses water pledge, charizard uses fire pledge (rainbow!)

turn 2, inteleon switches to dundunsparce, charizard switches to abomisnow

blizzard 10% x 2 (serene grace) = 20% x 2 (rainbow) = 40% freeze chance

KEEP SPAMMING BLIZZARD!

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Bold of you to assume your Pokemon would be fast, bulky, and lucky enough to pull off this strategy.

Answer 1

I would say Ho-oh or pecharunt because Malignant Chain and Sacred fire has 100% burn greatly raising its physical bulk and pecharunt has a 100 bp 100 acc STAB that badly poisons, and confuses the target. here are some moves that can greatly benefit from the rainbow:

Rock Slide
Sacred Fire
Malignant Chain
Scald
Scorching Sands
Blizzard
Tri Attack
Muddy Water
Diamond Storm

In terms of viability you need "Giga draining you own mimikyu" godly teambuilding. I would recomend Inteleon for water pledge, dundunsparce/shaymin/meloetta/Jiracji for serene grace abuse, pecharunt and/or Ho-oh for tanks and rabsca for trick room to support dundunsparce, revival blessing in case your fire/water pledge guys are KOed early and resists dundunsparces only weakness. I doubt It will go far but try your best!

EDIT: I just remembered toxic chain, you really should have a toxic chain user on your team.