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While the wielder is at 100% HP, all damage from attacks is halved. Only the first attack of a multi-hit move is affected by this ability.
Dragonite and Lugia are renowned for being bulky and difficult to kill outside of a super effective attack as it is, and Multiscale only boosts this further, making them virtually impossible to OHKO outside of STAB Blizzard from something like Glaceon. Combined with Roost or Recover, which can easily bring them back to full health while the opponent tries to attack with a low PP move such as Stone Edge, Lugia and Dragonite become insane walls who are also more than capable of hitting back.
Found in Dream World