Best teemo build

I would switch out Rylai's for Frozen mallet. Don't think Teemo's poison proc's the slow.

All of that looks ok except last whisper. You should switch it out for shoes. if not shoes then at least an AP item.

Rylai + Liandry for shrooms, BotRK+Last Whisper. You are dividing Teemo's power between his shrooms and his auto's. You're not gonna kill me with your darts, and neither will your shrooms. You should either focus completely on his shrooms (more ap) or focus on his on hit (drop Liandry and Rylai for Wit's End and Frozen Mallet)