Palkia (Origin Forme)

Origin Forme Palkia is one of those Pokemon: the type of Pokemon that actually managed to live up to its hype. Palkia was always just short of being great, but its Origin forme gains additional Attack and access to Spacial Rend, putting it about on a par with the top Dragon Type shadows. This thing is a true monster, and very much worth adding to any Dragon Type team, as it has the sheer power to be worthy of consideration in conjunction with a Water sub-typing that is frequently valuable against coverage moves, in particular Fire and Water, both of which it double-resists

And Raid utility isn't the only reason to use Palkia - Origin Forme! Alongside Dialga - Origin Forme, this is the first individual Pokemon that's capable of directly effecting the way that Pokemon Go is played! Any Palkia - Origin Forme that has the move Spacial Rend is capable of using a unique Adventure Effect that increase the range at which the player is able to see and encounter wild Pokemon for 6 minutes at the cost of 5 Palkia Candy and 5,000 Stardust, extending them for up to 2 hours per individual use, and up to 24 consecutive hours total. This gives added value to Palkia - Origin Forme, and makes it a must-have for any trainer's team!

Best PvE Offensive Moveset

• Dragon Tail and Spacial Rend* is, by far, the strongest moveset option for Origin Forme Palkia.
• Dragon Breath or Draco Meteor can sub in, but both will result in lower performance. Dragon Breath can potentially outperform Dragon Tail in a 2-man Party Play as it charges up Party Power more quickly.
• Fire Blast, Hydro Pump, and Aqua Tail do Origin Forme Palkia no favors.

Dragon Tail has slightly better stats on paper, but Dragon Breath is easier to use and benefits significantly more from certain breakpoints. 

Aqua Tail costs significantly less than Palkia-O's other options and allows it to output STAB Water-type damage consistently and provide shield pressure. Spacial Rend is a strong attack at a moderate cost, serving as a more reliable Dragon-type choice than Draco Meteor. Draco Meteor is extremely strong, but it is more expensive than Spacial Rend and the drawback can be nasty. Fire Blast can be used to melt down Steel-type Pokemon that attempt to wall a farmed Palkia-O, but it is an incredibly unreliable move. Hydro Pump is an option to severely dent Fairy-type Pokemon, but Palkia-O often already does enough Water-type damage with Aqua Tail.