moltres for me when i was going to beat the elite four and i catch moltres everytime with it just to get him out of the way and i catch zapdos with a great ball articuno with a ultra and mewtwo with a ultra. and i have done it the same everytime
A ditto. As I was a kid at the time I didn't know what a percentage was. So when the description said "You can use this to catch pokemon 100% of the time!" I thought it meant you could catch 100 pokemone with it.
I like how everyone caught Mewtwo or the legendary birds when, with my first Master Ball, I caught a level 32 Nidorina. Simply because I didn't know what a Master Ball did at the time and I didn't know it was a one time per playthrough item.
So I purposfully used mine on a level 32 Nidorina.