i would say zapdos moltres and articuno because they are all flying Pokemon and articuno is ice so it can have a chance of freezing the other ones.
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mewtow zapdos moltres articuno mew entei raikou suicune
Zapdos, Articuno, Moltres, Mewtwo, Entei/Raikou/Suicune (depends on what starter you chose).
You can catch Suicune, Entei, Raikou, Lugia, Ho-Oh, Celebi, and Mewtwo, Moltres, Zapdos, and Articuno.
four without cheats Articuno Zapdos Moltres Mewtwo plus one of the legendary dogs; entei, suicune or raikou
If You have The ROM i am pretty sure that not only the three Legendary Cats, but Zapdos Moltres And Articuno are in there too Suicune=Cheetah Entei=Lion Raikou=Tiger