The Porygon rank gives you the [Porygon] prefix in-game, and also the following perks:

• Access to the /perks menu
• Access to the Snowball Sniper and Snowball Shotgun tools
• /craft Opens a 3x3 crafting table
• /stonecutter Opens a stonecutter crafting menu
• /nightvision Permanent nightvision effect
• /enderchest access to your enderchest anywhere
• /pc access your pokemon storage network wirelessly
• /hat Wear any block (or sometimes items) on your head
• /sit Sit down and take a break where ever you feel like
• Corresponding rank in discord
• 8 minute cooldown timer on emote commands (rather then 10)
• 1 extra row in your enderchest storage
• 2 extra /sethome's
• 2 extra /daycare slots
• 2 Global Boosts

You also have access to the [Wynaut] prefix from the Wynaut package