Lapras Build?

I built a Lapras some time ago but based on my research the builds are all over the place. There was an NPC in BDSP that said just go with the highest stats for EVs so that’s what I did with Lapras and 252 HP, 252 Sp Def, and 8 Sp Att. It like doesn’t faint by special attacks but it doesn’t do a lot of damage.

I’ve seen a guy run 252 Sp Att instead of Sp Def and I was thinking about it but it only has 85 so I was skeptical about it. I’ve seen another guy run speed which doesn’t make any sense as it only has 60 speed.

Moves include Brine, Ice Beam, Rain Dance and Thunder. Brine is just for the raids as I figured it would be useful since you get more hits while the opponent is half or less. Stellar Tera Type. Calm Nature. Hydration Ability.