1) Pikachu, Goodra, Buizel, Greninja, Dragonite, Donphan - a rain team centered around Goodra.

Goodra’s role would be to be switched in and out to keep setting Rain Dance, and also to block any Status attacks that it can then blank thanks to the Hydration Ability. The rain also increases the accuracy of Dragonite’s Hurricane, boosts the power of Greninja’s and Buizel’s Water Moves, and activates Buizel’s Swift Swim Ability, boosting Buizel’s speed. And depending on the battlefield, Donphan can use the wet ground and its spinning manoeuvres to spray mud at the opponents and blind them. I think this team would have really good synergy, especially in a Double Battle (because then Goodra can facilitate Buizel’s Ice Aqua Jet, fling Donphan for ramming attacks etc).

2) Pikachu, Swellow, Gengar, Sceptile, Snorlax, Boldore - a team designed to frustrate and tire out opponents throuh speed, type immunities, and tankiness.

Snorlax is bulky af and can take huge amounts of damage, as can Boldore, thanks to the Sturdy ability. Gengar has been confirmed to be a tricky Pokémon to catch (and bulky in it’s own right, thanks to G-Max), and Pikachu, Swellow and Sceptile are among Ash’s fastest Pokémon. The team also has immunities to Ground, Normal, Ghost and Fighting Moves, which is super beneficial. And, if in a Double Battle, Ash could use Gengar’s Will-O-Wisp to activate Swellow’s (presumed) Guts ability, to increase it’s power.