you can use various Wonder Mail codes/action replay stuff i don't know a great deal about, but probably the easiest way is to recycle items at Spinda's Café until you get one as a consolation prize (NB it is rare so this may take a while).
You can find a golden seed randomly in a golden chamber.
In every dungeon... It's just 'bout luck
if you use it, it will raise your level up
reserch you people
The answer is the lookalike item of the sleep seed called a slip seed.
The joy seed causes the Pokemon who eats it to gain 1 level
It makes your Pokemon level up 5 levels
throw a sleep seed at him and just pound him with power attacks
The only way is to have a reviver seed
a@qoi dfcgh erdt= 1f7#8 29862 @,h3e this is how i got a golden seed
Yes, there are Joy Seed Codes for Pokemon Mystery Dungeon Red.
There are 2: joy seed=1 level up golden seed=5 levels up