Chansey > level up with max happiness > Blissey
Chat with our AI personalities
First you need a chansey which firered and leafgreen can get then to evolve chansey it needs max friendship with its trainer it will then evolve to blissey.
chansey does not evolve by level. it evolves by happiness. i hope this helped!
One needs to increase Chansey's happiness to its maximum.
Since you can't catch chansey you need to trade one from firered, leafgreen or Pokemon xd gale of darkness.
You can't evolve Yanma in Leafgreen. This is because Leafgreen was made before Yanmega was made. So basically in Leafgreen, Yanma is a Pokemon that can't evolve.