There is no easy way to get Lapras in Diamond, unless you want to go out and buy an Action Replay. Sorry, man.
Lapras? Easy!!!! First you have to beat the Elite Four and obtain the national dex. Before you did this there was a man blocking a section of victory road. In that section is a body of water. Swim on it and there is a 75% chance a Lapras will appear.
you need a cheat that can catch a trainer's Pokemon to have lapras. because there is a trainer that has a lapras.
No...
National: #131
there is no easy way celebi evolves at 200
you can catch lapras with any ball, just make sure you damaged him already
Dont get him
Get a pokeball.......
fish at the poke' league waterfall using the super rod
you find lapras in the safari zone ROCKY BEACH setting. surf in the water and you wil find lapras.they are very easy to find.
You either use Pal Park or you can find it in Victory Road in the Water (Super Rod)
Two ways Easy way: Migrate from FireRed/LeafGreen (Recieve at Lv 25 in Silph Co.) No-Trading Way: Can be found in the Post-Dex area in Victory Road in the Water.