Lapras

Lapras is a potent special attacker backed up by solid bulk and a good variety of coverage and utility moves, such as access to Blizzard and Sing. While it faces strong competition from other Pokemon with similar coverage, such as Starmie, its combination of power and bulk, as well as access to Sing, gives Lapras a unique set of qualities that give it an important niche in the metagame. Access to STAB Blizzard, as well as Thunderbolt, enables it to hit almost every Pokemon in the game for at least neutral damage, making it quite difficult to switch into. Its Speed is just enough to get by Chansey as well, allowing it to potentially put it to sleep one-on-one. It also has positive matchups against Tauros and Snorlax, two of the strongest Pokemon in the metagame, which can be crucial in many instances.

However, Lapras is bogged down by some flaws. Lapras's typing leaves it with a weakness to Thunderbolt and neutrality to Psychic, which often makes it easy to wear down with Pokemon like Starmie and Alakazam running around. It also struggles mightily against Chansey if it can't put it to sleep, which stonewalls it with its incredible bulk. Regardless, Lapras holds a niche in RBY OU, and it sees success on quite a few teams.