I gave a copy of the romhack to my little sister and played it with her, so this is the second completion I've done. (Last time I used a Chimecho, and had a truly powerful Azumarill)
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From Left to Right:
Seaweed the Tsareena - By holding a Grass/Fighting Gem and using its super high powered STAB moves in High Jump Kick and Power Whip, can annihilate anything which is weak to it, although it has fairly low survivability. Really useful during the Wallace Fight at the end of the elite four, along with running Assault Vest + Punishment to defeat Phoebes terrifying Calyrex-Shadow, since when it has KO'd a pokemon, Punishment deals more damage.
Knife the Gallade - Mega Evolution, high power and speed and access to a priority move in Shadow Sneak allowed the Gallade to very easily check and revenge kill pokemon. Most memorably during the Phoebe fight it was the last pokemon vs. lunala, and took 40% health with Night Slash, survived on 1 HP, then killed with Night Slash, since Lunalas ability lowers the damage of the first hit.
Sushi the Swampert - A good special tank running Assault Vest, especially for its good switch in on electric moves, along with pivot to other pokemon with Flip Turn.
Griddle the Corviknight - A very good physical wall with leftovers + Iron Defense, along with Body Press and Power Trip allowing its set up to destroy physical attackers. Its mirror coat ability also came in clutch against wallaces Gyarados, being able to wall it and hit back with a super effective Body Press.
The Chef the Azumarill - A true power house of a pokemon, Azumarill actually KO'd 5 of Alternate Reality May's pokemon, by the end running a standard coverage set, along with Waterium-Z to boost its Aqua Jet, allowing it to end pokemon with low health.
Oven the Delphox - The only special attacker on the entire team, hitting hard with Blast Burn and Psychic, along with having tools to nerf opposing pokemon, being extremely important during the Drake fight to nerf Dragonite, allowing other pokemon to not die instantly to its Extreme Speed.
Overall, if anyone is having difficulty with Roxanne's Gym, the most important advice is to pick up a Marill. Aqua Jet/Bubble both are incredibly good, and Azumarill learns Play Rough before Brawly.