[Surprise!] Puzzle & Dragons GOLD, Available at $9.99 for Limited Time
1/14 (Tue) 11:00am - 1/31 (Fri) 11:59pm PST
From now until January 31, Puzzle & Dragons GOLD is available at $9.99 (USD) to celebrate its launch! If you’re interested in PAD GOLD, don’t miss out!
The game will cost $14.99 USD after this period. This seems to be only for North America store only, but not Japan store.
Links: Nintendo Switch page
is there a reward similar to the pokemon game?
Do you mean a preorder bonus? If so, then no, there was not one. Also, the game has been out since yesterday, so you would not be able to preorder it anymore anyway.