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Starmie. Both can learn Electric-Type attacks, which kill each other, but Starmie is faster and has high Sp. Attack to easily outspeed and beat Lapras, so Starmie.
The difference between Salamence and Garchomp:
Garchomp Salamence
Medium HP Medium HP
High Attack Higher Attack than Grachomp
Low Defense Higher than Medium Defense
High Sp. Attack VERY High Sp. Attack
Low Sp. Defense Low Sp. Defense
High Speed VERY High Speed
Stealth Killer is a Pokemon that maximizes it's Attack/Sp. Attack, and uses it's powerful moves to beat down the opponent. Swords Dance does Attack, so good thing it's a Physical Move ^^
If you want Garchomp to be a Stealth Killer, then I'd suggest putting in Swords Dance. If you want him to be a well rounded Skill Attacker, then I suggest DR.