Hildagarth

Team:
Dewgong (50): Aqua tail, Single beam, Ice beam, Fake out

Lapras (50): Body slam, Ice beam, hydro pump, Drill run

Weavile (50): Nasty plot, Revenge, Ice shard, Psycho cut

Primarina (50): Moonblast, Sparkling Aria, Blizzard, Sing

Glaceon (50): Blizzard, Rest, Attract, Hyper beam

Tundragon (52): Earth tail, Dragon pulse, Giga drain, Iron tail

When you defeat her: The skate charm, TM for Ice beam, some ingredients, Skates, and a never melting ice.

She doesn't offer you a pokejob, but you do get to compete in hockey games for items.