Tentacruel is probably the best Trick taker. I actually considered giving it a Choice Scarf for a while, anyway. It would help against guys that raise their Speed, for instance, and also let me strike at Salamence / Gyarados before they get a chance to move. Of course, if they bring out their Tricker late game, I make other decisions, for instance, I might let Skarmory take the Trick if they have SD Heracross.