>>27230507In-story, Palkia makes more sense than Dialga as far as making a new world.
In fluff, it is absolutely underrated. Dialga can stop time, and go back to kill your grandpa, but Palkia can pop you into the sun. Or pop the earth into a bag of doritos, and turn the sun into a cheesy, salty powder to cover them with.
In-Game, even a six-year old can' fuck up with Palkia. Spacial Rend and Surf are pretty much all it needs to sweep the rest of the game, no problem. Dialga on the other hand needs TM's more, and can wind up screwed over if you tag Roar of Time at the wrong moment.
Design-wise (not there yet), it looks far more dynamic and mobile than Dialga, or even a lot of legendaries in general. You can see how Palkia would work if it were to run. Zekrom, Kyurem, Dialga, and Xerneas? All of them look like they either hobble and lurch around, or scramble like Scooby-Doo.
Power creep's a bitch. It used to have a place in ubers as a one-stop "throw it in" against most opponants, and was the safest Kyogre switch available. Its stat spread let it be absolutely vicious on a lot of teams, able to ram through most things with 150 base SpA, and punch through Blissy with that impressive Attack.
Even in X and Y, while Zekrom horned in on a bit of Palkia's turf, Palkia remained a great generalist choice, suitable for most any team as a "fill in the blanks" mon.
Then the time of X and Y hit. Palkia found itself burdened with something unforgivable. It became a liability. Any time Palkia is out is a time Xerneas gets a free switch. Further, Palkia's stats, while great for a generalist, fell by the wayside of increasingly minmaxed competition. The final blow was ORAS. Kyogre became irrelevant, and Palkia couldn't even fight off P-Don with any reliability, meaning it couldn't force a trade with an incredibly popular mon.
Then, the penis. Yes, Palkia is a mighty, erect, penis, with a pair of pulsating, glowing testicles. It also has a pompadour. That's all anyone sees.