Well... it pretty much is easy. Mew = shedinja
deoxys = skill + the fighting one
celebi = skill
umm.... rayquaza = gengar
kyogre = skill
groudon = i forgot , but it was easy
steelix = circle around the head area , i thought that helped also a ghost helper
entei on the last mission was probably the hardest but even with gengar, easy.
being a decoy to the go-rock squads base was sorta hard too, but easy