Bug / Steel
It powers up Fire-type moves if it's hit by one.
The Caterpillar Pokemon
Steel-A hard, strong, gray or bluish-gray alloy of iron with carbon and usually other elements.
Caterpillar-The larva of a butterfly or moth.
HP:25 | ATK:25 | DEF:25| SP.ATK:25 | SP.DEF:25 | SPD:25
Steepillar's body can form into a larger one. It can form that large, it can be larger than a whole city.
Evolves to Metathra at level 70