As a Pokémon expert with a deep understanding of the Pokémon universe, I can provide you with an accurate answer to your question.
Mew is a unique Psychic-type Pokémon known for its elusive nature and its place at the evolutionary pinnacle of the Pokémon world. It is often depicted with the ability to learn all moves, which is a significant aspect of its character. However, Mew does not have the innate ability to physically transform into any other Pokémon. Instead, Mew is renowned for its genetic link to all Pokémon species; it is said that Mew's DNA is the blueprint upon which the genetic code of all Pokémon is based.
This genetic similarity allows Mew to
learn any move through TMs (Technical Machines) and HMs (Hidden Machines), which is a gameplay mechanic that has been present since the early Pokémon games. Mew can also
inherit moves from its pre-evolutions, as seen in some of the games where Mew has a pre-evolution, although this is not part of the main series continuity.
In summary, while Mew is not capable of physically transforming into other Pokémon, it is closely connected to all Pokémon through its genetic makeup and its ability to learn a vast array of moves.
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