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Lahars move rapidly down valleys like rivers of concrete. If you are on the floor of a valley that leads from a volcano and become aware of an oncoming lahar, seek high ground. Lahar is an Indonesian term that describes a hot or cold mixture of water and rock fragments that flows down the slopes of a volcano and typically enters a river valley.
Ok I can see tyranitar being first but aerodactyl has amazing speed. Mega Aerodactyl is the fastest Pokemon of all time. Notice I said MEGA Aerodactyl not regular Aerodactyl. but regular aerodactyl is still top 5 fastest. has good move pool. Rock head allows it to use strong attacks like take down without recoil.