He has Xatu for Hazards hate, Chansey is the Special Sponge to complement Skarmory, Chansey + Latias already takes a poop on Rain teams, Tentacruel compounds to his weakness of Terrakion + Mence + Lucario + etc etc (insert sweeper). The idea of an Intimidater on an a team is almost a necessity in current BW for teams like this - it's why Landorus-TigerThingy is almost a staple for me.
Qwilfish is unique and actually serves specific functions towards the team, I dislike that you're brushing it off with shitty reasons. Maybe Tentacruel could be a better fit but certainly not for the reasons you stated.