Most non-legendary Pokemon have an evolution line of some sort. There were a handful of Generation 1 Pokemon that didn't have an evolution line whatsoever, but that was mostly rectified with Generation 2's baby Pokemon and Generation 4's new evolutions. One Gen 1 Pokemon that has yet to receive any kind of evolution or baby form is the Wild Bull Pokemon Tauros, so one Pokemon fan has taken matters into their own hands.
Pokemon fan and Reddit user xSilentWalrusx has created fan art designing their own regional variant of Tauros, giving that regional variant an evolution in the process. This regional variant of Tauros turns the Normal-type Pokemon into a Rock/Ground-type, tweaking his color scheme and adding rocks to his body. This version of Tauros evolves into Steeros, which swaps the rocks for steel, making it a Steel/Ground-type Pokemon.
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Regional variants, for those who haven't been following the Pokemon franchise closely in recent years, is a relatively new concept that was introduced in Pokemon Sun and Moon. The basic concept is that certain Pokemon can take on different appearances and types based on the regions they're found in. For example, while most Pokemon fans know Vulpix as a Fire-type Pokemon, the Alolan Vulipx variant is an Ice-type Pokemon instead.
This concept of a regional variant and evolution for Tauros is just the latest take. Pokemon fan Bearys_Cave also designed a regional variant for Tauros, though their version is much darker than the one presented by xSilentWalrusx. Bearys_Cave designed a Ghost/Steel-type version of Tauros that doubles as a criticism of bullfighting practices in Spain, with their version of Tauros stuck with steel javelins.
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