Welcome to PC!
This forum isn't a place for asking others to build a team for you. We're here to guide you through the process. First off, I recommend checking out our
resources.
Smogon's Gen 6 Pokedex is especially important for finding good movesets. Here are Lapras' analyses (
1 &
2). Lapras isn't good in Battle Spot or OU though, mainly because its Ice-type gives it weaknesses to Fighting and Rock as well as a weakness to Stealth Rock. There better bulky Waters that pull off the role better, such as Manaphy, Rotom-Wash, Slowbro, and Suicune. However, if you insist on using Lapras, I suggest using a Pokemon that can remove entry hazards (e.g. Stealth Rock and Spikes), so Gliscor or
[email protected] with Defog would be good to use.