How to Get Meloetta in Pokemon Black and White
Like the Generation IV games, Pok�mon Black & White have a number of areas of the game activated solely by having certain event Pok�mon within the games. These events vary from giving you Pok�mon, to items, to even special moves.
Location: Castelia City
Method:
The next gift Pok�mon is the Illusion capable Pok�mon, Zorua. To get Zorua, you will need to have first transferred Celebi over to Black & White using the Relocator. Once done, take Celebi to one of the buildings in Castelia City where you['ll see a girl with another girl who is apparently lost. Celebi will come out from its Pok�ball and the lost girl will shed her illusion and turn out to be Zorua. Zorua will be offered to join you. However, you do need a Pok�ball as one will be used up when you obtain it. It can be any ball.
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| ??? Nature. Date of Receiving Castelia City. Caught at Lv. 10 | ||||||||||||||
Location: Lostlorn Forest
Method:
When you transfer Raikou, Entei or Suicune from your games to Black & White, you will be able to get access to the Lostlorn Forest area. This area will feature a character who mentions a Pok�mon that has been known to create illusions. You will find a Pok�mon matching one of the beasts that you didn't transfer over. If you send over Raikou, you will see Entei. Send over Entei and you'll see Suicune and send over Suicune and you'll see Raikou. When you attack, you'll see that it is in fact a Zoroark. This is the only way you can capture Zoroark.
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| ??? Nature. Date of Capture Lostlorn Forest. Caught at Lv. 25 | ||||||||||||||
Location: Moor of Icirrus
Method:
When you obtain a Keldeo from a special event, if you take it to the Moor of Icirrus while also having Cobalion, Terrakion and Virizion within your team, you will learn about the history of Keldeo and how it was orphaned and raised by Cobalion, Terrakion and Virizion. He will then tell you that he can teach your Keldeo a special move; Secret Sword, a move unique to Keldeo
| Name | Type | Cat. | PP | Att. | Acc. | Effect |
| Secret Sword |  |  | 10 | 85 | 100 | The user cuts with its long horn. The odd power contained in the horn does physical damage to the target. |
Location: Castelia City
Method:
When you obtain a Meloetta from a special event, if you take it to the caf� in Castelia City, you will learn about how Meloetta lost its voice in times past. It will soon get inspired and will finally start singing. Doing so allows you to teach it the special move Relic Song, which will change Meloetta's form in battle whenever used
| Name | Type | Cat. | PP | Att. | Acc. | Effect |
| Relic Song |  | | 10 | 75 | 100 | The user sings an ancient song and attacks by appealing to the hearts of those listening. It may also induce sleep. |
Location: P2 Lab
Method:
When you obtain a Genesect from a special event, if you take it to the P2 Lab, you will find a scientist in there. He will tell you about how he was the one who researched Genesect and modified it to aid in Team Plasma's plans, but failed to win the approval of N with his methods. He will challenge you to a battle. if you defeat him, he will gift you two special drives. These items, when attached to Genesect, will change the type of its special move; Techno Blast. There are four drives but they are exclusive to each game
How to Get Meloetta in Pokemon Black and White
Source: https://www.serebii.net/blackwhite/ingameevent.shtml