Rain
Dry Skin:
Croagunk, Paras, Parasect.
Forecast:
Castform
Hydration:
Seel, Dewgong, Smoochum, Lapras, Barboach, Whiscash, Luvdisc, Phione, Tympole, Palpitoad, Ducklett, Swanna, Alomomola, Shelmet.
Swift Swim:
Psyduck, Golduck, Poliwag, Poliwhirl, Poliwrath, Horsea, Goldeen, Seaking, Magikarp, Omanyte, Kabuto, Mantyke, Mantine, Lotad, Lombre, Ludicolo, Surskit, Anorith, Armaldo, Feebas, Relicanth, Luvdisc, Buizel, Floatzel, Finneon, Lumineon, Tympole, Palpitoad, Seismitoad, Tirtouga, Carracosta, Beartic.
Rain Dish:
Squirtle, Wartortle, Tentacool , Lotad, Lombre, Ludicolo, Wingull, Pelipper, Surskit.
Sun
Chlorophyll:
Bulbasaur, Ivysaur, Oddish, Gloom, Vileplume, Bellossom, Bellsprout, Weepinbell, Victreebel, Exeggcute, Exeggutor, Leafeon, Hoppip, Skiploom, Jumpluff, Sunkern, Sunflora, Seedot, Nuzleaf, Shiftry, Tropius, Cherubi, Sewaddle, Swadloon, Leavanny, Cottonee, Whimsicott, Petilil, Maractus, Deerling, Sawsbuck.
Dry Skin: ( doesn't benefit but whatever )
Croagunk, Paras, Parasect.
Flower Gift:
Cherrim
Forecast:
Castform
Leaf Guard:
Leafeon, Chikorita, Bayleef, Meganium, Hoppip, Skiploom, Jumpluff, Budew, Roselia, Swadloon, Petilil.
Solar Power
Sunkern, Sunflora, Tropius, Charmander, Charmeleon, Charizard
Hail
Forecast:
Castform
Ice Body:
Seel, Dewgong, Glaceon, Snorunt, Glalie, Spheal, Sealeo, Walrein, Regice, Vanillite, Vanillish, Vanilluxe.
Snow Cloak:
Glaceon, Articuno, Swinub, Piloswine, Cubchoo, Beartic.
Sandstorm
Sand Force:
Diglett, Nosepass, Probopass, Shellos, Roggenrola, Boldore, Gigalith, Drilbur.
Sand Veil:
Sandshrew, Diglett, Dugtrio, Geodude, Graveler, Golem, Phanpy, Larvitar, Cacnea, Cacturne, Gible, Gabite, Stunfisk. ( lol )
Sand Rush:
Sandshrew, Herdier, Drilbur.
Didn't do the bit about unreleased abilities, I didn't get it. If you explain it to me, I'll edit it in. :]