You'll get added to a sub-only chat in discord. So make sure your discord is linked and you join the Rose Garden.
In that chat, you'll get some info first, more Pokémon to catch, access to content creator resources, and more.
You get added to the end credits of the newest videos as a thanks for the support!
You also get added to the website's wall of awesome.

5% off in the shop

This would be the best replacement if you have subbed to Twitch in the past or a great option if you are watching from YouTube and want to support! Pretty much the basic support tier.

Want to give a little more?
You also get all the previous tier rewards.

This is the best tier because you get all the perks and bigger store discounts and you are supporting my randomness.
All previous rewards

Get 8% off in the shop instead.