If you wish to get max attack and speed on a pokemon your looking at 252evs in each.
Using Vitamins on pokemon only allows you to give the first 100 in each stat unfortunatly so basically if you give 10 x proteins and 10 x carbos you will gain 100 towards your goal of 252 in each. The remaining 152 evs will need to be gained from battling pokemon that give speed and attack evs. Use
this and
this to help with what that.
If you defeat one staraptor with magby for example you will gain +3 to your attack evs.
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