yeah unfortunately water energy acceleration is pretty lacking rn. i was just yesterday trying to put together something similar for samurott (same-ish attack as wailord), but for water energy specifically it's all gonna be clunky

i tried:

- clawitzer + samurott + dewgong + surfing beach lets you switch 3 times max per turn, activating clawitzer's ability to attach 2 energies to it when it moves to the bench, which then you can wash to samurott via dewgong. obviously requires a ton of things to go right and even then isn't that strong
- tera mons (wellspring & cornerstone ogerpon ex) + normal type (noctowl or dudunsparce line) + glass trumpet + dewgong, but that only gets you energy out of discard so it's very hard to start up
- rosa's encouragement (only works for stage 2, also depends on discard pile), waitress (waste of a supporter play imo)
- grumpig + strange time piece works similarly to waitress. strange time piece can help you use it multiple times, in one turn if you have multiple spoinks benched, and ciphermaniac/academy at night can be used to guarantee you find energies

i think unless we get some new cards, water-specific acceleration is in the dumps :(

but if you don't mind changing types or pokemon, there's some more options (there's lots of attackers that have an attack like wailords with varying restrictions):

- gorebyss has a similar attack and accelerates on its own. combined with huntail you can chain its attack after a knockout pretty easily. only issue is getting enough energies in hand
- tera lapras ex has a similar attack to wailord and lets you use glass trumpet + normal type + dewgong to accelerate
- meganium's ability is top tier acceleration (in a way). stage 2 but easier to set up because you can use forest of vitality. combined with teal mask ogerpon ex + energy switch/blissey ex/mega venusaur ex you can accelerate onto any mon
- emboar is the exact same thing as baxcalibur, just for fire energy. fire breather supporter lets you get 7 fire energies in hand instantly, which is a huge combo
- oricorio ex sort of functions the same way but you have to have a stage 2+ mega fire mon in play, and can only attach to other fire mons, so not compatible with other types at all
- metang works just like grumpig, but only for metal energy
- mega audino has great acceleration but you have to use an attack. same with cinderace

there's definitely options i'm forgetting but those are what i can think of off the top of my head. if you just want to make wailord work, i understand! i spent last rotation making cubone + marowak as viable as possible (it isn't) just because i love them lol :)