1) Soothe Bell
2) Vitamins
Pokemon Colosseum: Joy Scent, Vivid Scent
By the way, Blissey learns moves as well, so you don't have to work your tail off getting it to level 57 to learn Double-Edge if you're that obsessed. Aside, check this out:
Chansey's level-up moves:
S: Pound
5: Growl
9: Tail Whip
13: Softboiled
17: Doubleslap
23: Minimize
29: Sing
35: Egg Bomb
41: Defense Curl
49: Light Screen
57: Double-Edge
Blissey's level-up moves:
S: Pound
4: Growl
7: Tail Qhip
10: Softboiled
13: Doubleslap
18: Minimize
23: Sing
28: Egg Bomb
33: Defense Curl
40: Light Screen
47: Double-Edge
There we go... Not only does Blissey have better base stats, it learns moves quicker too! Please note that I have typed here the 2nd generation Bliss moves, not 3rd! lol
BTW MP Sniper, you may have been referring to Pokemon R/B/Y, but in FR/LG it's not possible. You can only get it in the Safari Zone, as SM acclaimed.
I am a signature... But what am I if my master does not type anything on me? Wait...What am I saying, 'master'? I choose my own destiny... Ah, screw it! I'll stay in this bar for a couple of more years...