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Meditite and Medicham are the yoga pokemon.
Meditite is always doing the "lotus position".
Meditite is also an aprentice, who has yet to "blossom".
The Lotus is often used as a metaphor for enlightenment.
Mega Medicham is enlightened.
Thus, Meditite's head resembles a lotus bud while Mega Medicham's resembles a fully blossomed lotus.