You have to level it up when it likes you a lot.
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Chansey must have max frienship with its trainer to evolve this means you could have a level 6 Blissey as long as you make your chansey happy.
Make it happy catch it in a luxury ball and give a massage and feed it some vitamins and a rare candy
Hope this helped:)
You cannot evolve Chansey in pokemon leafgreen as the evolvution was not invented for that game
To get chansey to evolve I'm pretty sure you have to like get high friend ship buy giving your chansey proteins.carbos,etc. Also you need the National Pokedex.
ditto does not evolve on firered or leafgreen
No it is not possible but you can evolve it on Pokemon Diamond and Pearl if you wanted.
u need to make chansey really really happy then level it up once then it evoles
nothing