The Tallest Grass Type

Serperior holds the record for tallest grass type, tallest fully evolved starter and, before B2W2 when White Kyurem came along, tallest 5th Generation Pokémon. And I know most serpentine Pokémon are measured by length but Serperior towers over Servine anyway.
that escalated quickly grass types serperior - 7659313408
From Zorua

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that escalated quickly grass types serperior