Buying this pack gives you one of each of Kanto starter Pokémon and a prefix to go along with them. 

Included:

• a level 1 Bulbasaur
• a level 1 Charmander
• a level 1 Squirtle
• Bulbasaur prefix: [Bulbasaur]
• Charmander prefix: [Charmander]
• Squirtle prefix: [Squirtle]
• Kanto prefix: [Kanto]

You can switch to any of these prefix's by using the /rank command in-game after purchase.