personally, i would choose latios because he usually has a very high special attack. you could argue rayquaza, but I'll give you latios's best moves too...
Dragon Claw/Dragon Pulse
Luster Purge
Water Pulse
Thunderbolt
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the strongest water Pokemon is Palkia
well the strongest Pokemon you can catch is raqazza a legendary dragon Pokemon
I think , all of the legendary pokemons.
PIKACHUUUUU
Rayquayza
shymin
Moltas: the fire legendary bird Pokemon the second strongest bird Pokemon
Reshiram. But if you make any other Pokemon stronger than it by level, yes, then it will be that Pokemon. But if you look to it by the side of legends and legendary power, it is Reshiram.
lucario
it is say that mewtwo but legendary pokemon arent powerful as thought
what are you crazy, they are two of the strongest legendary Pokemon but you can still clone them in emerald, look it up
ARcues