LogFAQs > #979453049

Gen I's trio is perfect...but there are only three of them.

Gen II is obviously a no.

Gen III does well, but Altaria/Bagon/Shelgon aren't good enough, and Salamence is one of my least favorite pseudos.

Gen IV's legendaries are awful.

Gen V's legendaries are awful, PLUS Deino/Zweilous/Druddigon.

Gen VI has some really good mega evolutions, but some flaws, and I'm not the biggest fan of the Goodra line.

Gen VII has far more misses than hits across the board.

Gen VIII has some big misses with Dreepy, the fossils, and Appletun.

Gen IX is very feast or famine with some of the options here, especially since I'm not a huge fan of the DLC paradoxes.

Ultimately, I think I've gotta go with VI, because it's one of the most through typings that small roster has to offer.