Main Series Games:
* Pokémon Black 2 & White 2: Meloetta was originally distributed via an event in 2012. It came with the move "Round" and held the "Memory" item.
* Pokémon X & Y, Omega Ruby & Alpha Sapphire: Meloetta was later distributed as a mystery gift, with the move "Round" and holding the "Memory" item.
* Pokémon Sun & Moon, Ultra Sun & Ultra Moon: Meloetta was distributed via a special event in 2018, with the moves "Round", "Close Combat", "Hyper Voice", and "Psychic" and holding the "Memory" item.
* Pokémon Sword & Shield, Brilliant Diamond & Shining Pearl, Legends: Arceus: Meloetta is not available in these games as a standard encounter. You might be able to obtain it via future events or trading with someone who already has it.
Pokémon GO:
* Meloetta was released in Pokémon GO as a special event Pokémon. You may be able to obtain it during special events or by trading.
Other Ways:
* Trading: If you know someone who has a Meloetta, you can trade for it.
* Online Auctions: Some online auction sites might offer Meloetta as a digital code, though it's important to be careful and only buy from trusted sellers.
Important Note:
* Event distribution is usually limited to a specific time period. If you missed the original event, it's unlikely you'll be able to get it through traditional means.
* Keep an eye on official Pokémon announcements and news sources for potential future events that may offer Meloetta.
I hope this helps!