Temmie is a useful yet cheap card that is best deployed early in game, however can be useful later when you need to use a card immediately after it is placed.
Temmie 2 also has 2/1, but only has Charge and costs 3G instead of 2G. And like most other cards, a shiny Temmie will give a shiny Temmie 2.
Temmie can get +2 ATK and +2 HP from an Temmie Statue, which can help out if your dealing damage to the enemy player. Also if an Allergic Temmie is on the board and this is summoned, the Allergic Temmie does 1 damage to all its enemy monsters.