An odd combination, grass and steel types.
Well, this is when Ferroseed fits the bill exactly.
Maybe Ferrothorn is your end goal?
Here's how to get one and evolve it.
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Shiny Ferroseed Guide
Where To Find Shiny Ferroseed
Ferroseed can be found in the wild, snow or sunny/clear weather conditions will boost its spawn rate due to being a steel/grass type.
They can be found in 10km eggs, Research Encounters and Raids too.
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How To Evolve Shiny Ferroseed To Shiny Ferrothorn
Evolving Shiny Ferroseed will create Ferrothorn.
It takes 50 Candy.
If you have enough select it and your Pokemon will evolve.