The Serebii list attached tells you what you need to do to get each medal (some are nearly impossible)
You just highlight them and read what they say, they tell you how to earn the medals. Some are a little vague, others are more direct. For example, one simply reads "Star in every available movie at the Pokestar Studios", once you've done that, the medal man who appears at the Pokecentres will give you that medal, replacing the hint medal.
Hint 1 : It is on page 24. Hint 2 : It is black. Hint 3 : It is located the same way you found the shadowy bat. :)
Black and white
Black. Some more black. A hint of red, then a lot more black.
Always Grey with a little hint of ligt brown. Adult bats are grey and a slit hint of black
The black hole, you have to destroy all the castles and get all gold medals to get it
There were 962 medals for 302 events. 302 Gold Medals, 304 Silver medals because of 2 ties for Silver, 356 Bronze medals including 56 events where 2 bronze medals were awarded
Shadow's best weapon is called the Ddraig goch. You can craft it with the following combination at the black smith: 2 Katana + 2 Orichalcum + 2 Dragon-Eye Stone + 2 Medals of Lancelot
The boy with the black silk handkerchief on his face has no medals because he may not have participated in any competitions or events that awarded medals. Alternatively, he may have chosen not to display any medals he may have won for personal reasons.
eight olympic medals ( 2 gold, 4 silver and 2 bronze ) and seven commonwealth medals.
red and a hint of brown/black.
to give you a hint about the zorua event