D. Snorlax = ability: overcoat - moves: body slam, power whip, synthesis, leaf blade
Milotic = ability: cute charm - moves: scald, hydro pump, moonblast, recover
Goodra = ability gooey - moves: dragon pulse, power whip, rain dance, outrage
Luxray = ability guts - moves: wild charge, electric terrain, thunderbolt, crunch
A good fun fire type or flying type,so I recommend Delta Bisharp
Change snorlax’s ability to Thick Fat it is much better.
don’t keep 2 water type moves on milotic
For other pokemon, get Volcarona. It is very fun to use, and can simply wreck it allowed to set-up A lucario too could be useful This team doesen’t need any defensive additions, the Snorlax-Milotic core is very solid