what does the site mean when im looking at Pokemon and it says daily Pokemon see here http://pokemondb.net/location/sinnoh-trophy-garden
Daily Pokemon are Pokemon that are in tall grass daily, which means you can find them everyday. (Hope This Helps!) :)
Daily pokemon are pokemon that will appear in a certain terrian(water,grass,etc.) here every day no matter what.
Hope it helped
EDIT- Ohhhhhhh you mean there? It means on certain days that pokemon appears in the garden. Hope this one helps