Initial shoulder mount effects and configuration

A Pokémon mounted on the shoulder should be able to give some form of buff or passive effect, and a species or form should be able to dictate whether it can be shoulder mounted or not. A simple system should exist for these. The first two effects that should be implemented in this task as a proof of system are as follows:

• Some shoulder mounted Pokémon work as a light source around the player. A Charmander is a good candidate for this.
• Some shoulder mounted Pokémon slow down the rate of falling past a certain threshold. Bird Pokémon are good candidates for this.