to get Blissey you need to first catch a Chancey in the safari zone it takes awhile for most people but have patience then when you catch Chancey train it for awhile nd make Chancey like you more and then eventually it'll evolve into a Blissey
Blissy can have more than 700hp but it has very low defense so it can take heavy damage.
If you are talking about the Sinnoh Pokedex, the Pokemon is Unown. If it is in the National Pokedex, I have no idea. But it should be easy to find on one of those online pokedexes.
Well, you need rock climb, strength, surf, waterfall, (and I think you need rock smash but I'm not sure). Yes you need rock smash! other wise you cant get passed the second level (after you defeat the ace trainer with a blissy and a golduck)
Chansey evolves by Happiness, not by level. Can evolve at any level, depends on how much he/she likes you. Chansey starts with a Happiness of 140, you have to get this value over 220 for he or she to evolve. To do this, you can have him/her hold the Soothe Bell, walk with him/her in your party allot, have him/her massaged, use lots of items on him/her or level him/her up allot for further information see: http://bulbapedia.bulbagarden.net/wiki/Happiness
well maylene has fighting types so use a flying type, you should probely go do some training your ponyta should be a good start, your prinplup should maybe know some steal type moves my sister's did. well i used my staraptar level 100 now,turtwig lv 80 now,lopunny lv 49, now ,blissy lv 42 now,azmarill lv 41 now,and my vileplume lv 55 now, sorry those are their level their on now i couldn't remember what level they where on check seribii for her Pokemon levels.HOPE THIS HELPED
evolve your chancey
59
Blissey won't evolve.
Blissey doesn't evolve!
Train a Chansey and will evolve.
happiny-chancey-blissy
the episode is called ignorance is blissy
Blissy, Blissy has the highest HP of any Pokemon once fully leveled and can learn a whole crap load of attacks
in victory road there is an ace trainer that you have to battle and she has a blissey
You can one either by trading, or by leveling up a Chansey
His Pokemon are a gengar,skarmory,tyranitar,blissy,salamance,and garchomp
There is no Blissy Pokemo on Emerald.Therefore there is no Shiny Stone.