Hi! So Today, When I was reading the SimplePets plugin page It required a plugin Aternos doesn't have!
Name: SimpleAPI
Site: https://www.spigotmc.org/resources/simpleapi.24671/
Desc: The API For the plugin SimplePets!
Name: BossShop (Spigot)
Site: https://www.spigotmc.org/resou…gui-shop-menu-plugin.222/
Desc: allows the plugin "BossShop" but more updated 
Name: TokenSlots
Site: https://www.spigotmc.org/resources/token-slots.34296/
Desc: allows people to have fun with gui based slot machines
