It has long been speculated as to why Chemecho's index number is the last of all Generation III Pokemon prior to XD: Gale of Darkness, even coming after Deoxys. Some think it could have been added late into Ruby and Sapphire's development. However, I think it could also be possible that it was originally created as a 'new Mew'. Though its stats are nothing like the others, there are some similarities.
Evidence in support:
*Its index number being the last of all Gen III Pokemon, which are all in National Dex order.
*It is a small, Psychic-type Pokemon
*Its height, 2'00"/0.6m, is identical to that of Celebi
*Its weight, 2.2lbs/1.0kg is similar to the other 'new Mews', being almost identical to Jirachi's, which is 2.4lbs/1.1kg
*Its catch rate, 45, is identical to that of Mew, Celebi, and Shaymin
Does anyone else think this could be possible?