Best Labras counter?

Any old Fighting type.

Lapras has too much HP; Magneton not enough. The battle with Lapras drags on too long for Magneton to be a reliable counter. Your dodging would have to be incredible, but Charge Beam is a slow move that makes it hard to dodge.

Omastar with the legacy moveset Rock Throw/Rock Slide.

Arcanine with FF / FT works great.

For me, the first run through is kind of a crapshoot. But once I find out if he has water or ice moves I give him Dragonite for water (resists water) or Tyranitar B/Se for ice (rock SE from him wipes him out).

Try Laturn with Electric Moves... It resist Ice and has bulk HP too....

Niantic. Nerfed em right outta the metagame

Lanturn with electric moveset

You need a Spark/Discharge magneton for it to be a good Lapras counter, and only a double ice one. Flash cannon is trash.

Go! Labras! Use your blice beam!!!!

Gengar is not really a type counter, but at least he is not resisted. Lapras is one of the few cases, when Gengar really can prove usefull.

For prestiging, if you don't know the moveset or the moves aren't same type, Lanturn since it resists both water and ice, electric is super effective and its high HP makes it CP efficient.

Poliwrath works both as a prestiger and maxed attacker since Dynamic Punch is so good.

Like Lanturn, it also has water typing that resists all of Lapras' current moves and has STAB + super effective moves against Lapras.

If it's double ice moves, discharge Magneton is also a good prestiger.

If double water, it's basically a weaker Vaporeon, any good grass type will do.

If it's an enemy gym and speed is most important, go with Machamp or Jolteon.

I use a 2500CP Arcanine or a 2400 Jolteon depending on my line up. Both work well. Just learn to dodge.