This is better for a few reasons
Assuming the four Birds you control are all Chocobo tokens, this puts eight extra power on the board once it flips
no longer resisted by Fire (+) now resisted by Normal (-) no longer resistant to Fighting and Bug (-) now resistant to Ghost (+) now deals no damage against Grass (-) Again, see above
For this reason, it's hard to pinpoint a single rarest card in Pokemon TCG Pocket , but there are several options
This would allow you to use it before you got the mana to cast it and, as it's repeatable, would let you potentially kill a lot of creatures
The main Constructed format, Premier, is a 50-card deck 1v1 Standard play with one leader, and you need to take down your opponents base first to win