You can Rank up by collecting 10 Flowers, and you can check your Ranking in the Ranking Info page.
You get a Gem every time you Rank up, and you can get additional Pokotumble rewards for earning Ranks.
You get a Gem every time you Rank up, and you can get additional Pokotumble rewards for earning Ranks.
Starting from Rank 338, you will only receive Gems as a reward and you will not receive any additional Pokotumble rewards for earning select Ranks.