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I used a Level 59 Articuno. It must know Ice Beam and Blizzard
Any Ice type move, Any Dragon Type move.
Dragon, Fairy and Ice-type moves. Fairy Pokémon are immune to Dragon.
try the ice cave on four island. (you have to beat the elite four first)
you have to have an electric dragon/ice and if you want a water
go to the next town and face Claire she has dragon Pokemon so use ice Pokemon and dragon type moves
Well the last gym leader is a dragon type leader so you need an ice type pokemon and/or dragon type pokemon. Idk what his name is but a guy gives you a level 15 Datrini and it is a dragon type pokemon. For an ice type pokemon, go back to the cave (idk the name of the cave but it is a ice cave) and get an ice type pokemon like swinub and raise him and beat Blair!
Dragon vs Dragon is best its super effective against each other if you believe me you try it. or ice.
You have to level your pokemon until 50-80.There are ice,rock,fight,poison,ghost and dragon.So you have to use thunder,phsyic,ice,water or grass.
The best ice Pokemon in firered and leafgreen is sneasel coz it have an very high attack stat and speed it can learn dark and ice attack such as ice beam blizard for ice beat up shadow ball and more..............
You Can't
any Pokemon has the potentional to beat rayquaza theres no 1 Pokemon that can beat rayquaza in battle although if you want his weaknesses his weaknesses are dragon and ice