its easiest to do in the hero garden by putting him next to that pillar so he gets stuck. Then you dont have to worry about him moving. --- pokemon black FC: 3053 2698 0999-Feel free to challenge me anytime on showdown or wi-fi. http://tinyurl.com/7gz6ewh -My pokemon for trade
Give him a fruit then position yourself as he's all omnomnom, then drop the animal as he finishes or tosses the fruit over his shoulder. That way you'll have enough time to reposition, and if he does move again you can just give him another fruit.
You're killing two birds with one stone by raising Stamina at the same time, I would suggest using the Hero garden for this as the fruits give more Stamina. --- I'm the squash for your juice, I'm pure, I'm concentrate.