On certain days you can get different items in the shop of the Pokeathlon Dome. But you need points to get the items. So you have to compete in the Pokeathlon to get the points.
Here are the you can get the different items:
Monday;
Red Apricorn; 200P
Blue Apricorn; 200P
Green Apricorn; 200P
MooMoo Milk; 100P
Moonstone; 3000P
Rare Candy; 2000P
After National Dex:
Full Restore; 500P
King's Rock; 3000P
Sun Stone; 3000P
Water Stone; 2500P
Shiny Stone; 3000P
Dusk Stone; 3000P
Tuesday;
Yellow Apricorn; 200P
Pink Apricorn; 200P
White Apricorn; 200P
MooMoo Milk; 100P
Fire Stone; 3000P
PP Up; 1000P
After National Dex:
Full Restore; 500P
Metal Coat; 2500P
WaterStone; 2500P
Water Stone; 2500P
Dusk Stone; 3000P
Dawn Stone; 3000P
Wednesday;
Blue Apricorn; 200P
Pink Apricorn; 200P
Black Apricorn; 200P
MooMoo Milk; 100P
Water Stone; 2500P
Heart Scale; 1000P
After National Dex:
Full Restore; 500P
Dragon Scale; 2500P
ThunderStone; 2500P
Moonstone; 3000P
Shiny Stone; 3000P
DawnStone; 3000P
Thursday;
Yellow Apricorn; 200P
Pink Apricorn; 200P
White Apricorn; 200P
MooMoo Milk; 100P
ThunderStone; 2500P
PP Up; 500P
After National Dex:
Full Restore; 500P
King's Rock; 3000P
Fire Stone; 2500P
Leaf Stone; 2500P
Shiny Stone; 3000P
Dusk Stone; 3000P
Friday;
Red Apricorn; 200P
Yellow Apricorn; 200P
Green Apricorn; 200P
MooMoo Milk; 100P
Metal Coat; 2500P
Nugget; 500P
After National Dex:
Full Restore; 500P
Dragon Scale; 2500P
Water Stone; 2500P
SunStone; 3000P
Dusk Stone; 3000P
Dawn Stone; 3000P
Saturday;
Green Apricorn; 200P
White Apricorn; 200P
Black Apricorn; 200P
MooMoo Milk; 100P
Leaf Stone; 2500P
Rare Candy; 2000P
After National Dex:
Full Restore; 500P
Metal Coat; 2500P
ThunderStone; 2500P
Shiny Stone; 3000P
Dusk Stone; 3000P
Dawn Stone; 3000P
Sunday;
Red Apricorn; 200P
Blue Apricorn; 200P
Black Apricorn; 200P
MooMoo Milk; 100P
King's Rock; 3000P
Heart Scale; 1000P
After National Dex:
Full Restore; 500P
Nugget; 500P
Sun Stone; 3000P
Fire Stone; 2500P
Shiny Stone; 3000P
Dawn Stone; 3000P
Hope this helps! :)
