You know, Kenya Starflight on Fanfiction actually has four HP/G1 crossover one-shots. They mostly involve the Weasley Twins instead of Harry, but they're all rather well written and most of them are hilarious. They're Four's a Crowd (http://www.fanfiction.net/s/3554236/1/Fours_a_Crowd), Double the Fun (http://www.fanfiction.net/s/3772154/1/Double_the_Fun), For Love of the Game (http://www.fanfiction.net/s/3951624/1/For_Love_of_the_Game), and Stronger Than Magic (http://www.fanfiction.net/s/4144115/1/Stronger_Than_Magic).
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They're Four's a Crowd (http://www.fanfiction.net/s/3554236/1/Fours_a_Crowd), Double the Fun (http://www.fanfiction.net/s/3772154/1/Double_the_Fun), For Love of the Game (http://www.fanfiction.net/s/3951624/1/For_Love_of_the_Game), and Stronger Than Magic (http://www.fanfiction.net/s/4144115/1/Stronger_Than_Magic).