LogFAQs > #979475897

Alright, let's look at this group:

Definitely not Gen III...lame Pika-clones, and I don't care for Manectric's design.

Not Gen VI. Already talked about Manectric's design being bad, but with such a small roster, Dedenne carries too much weight.

Not Gen VIII. There's almost nothing great here except for Toxtricity.

Not Gen V. The legendaries, Stunfisk, and the Eelektrik NFEs kill it.

Not Gen IX. Bellibolt's line, the pointlessness of Pawmi/Pawmo, and Sandy Shocks bring it down.

Not Gen IV. Shinx/Luxio/Pachirisu weigh it down too much.

Not Gen VII. The Geodude line could've been much better, and Togedemaru is disappointing.

Ultimately, it comes down to Gen I having a perfect roster, while Raikou is awful (plus Flaaffy is disappointing.)