Well about Gen. 5, patterns are still evident
For example:
-Cobalion (Steel/Fighting TBS=580 Ability=Justified)
-Terrakion(Rock/Fighting TBS=580 Ability=Justified)
-Virizion(Grass/Fighting TBS=580 Ability=Justified)
Fighting Type on this trio? TBS=580? Same Ability? They are a trio. According to the BW dex, this trio protected Pokémon in a war against humans. And also they do have a special move --- Secret Sword.
But wait!
Here comes Keldeo.
Water/Fighting TBS=580 Ability=Justified Special move=Secret Sword?
And if you look at these four Pokémon's Base HP stat --> All 91's
So the trio stated above is not just a trio... IT'S A QUARTET!
That's what I all know about them. About the Tao Trio---It's a long story.