Struggling to Survive in the Pokemon World

A story of a transmigrator returning once more to the moment it all began… The splendor and humiliation of his past life have long faded. In this life, the road to power must be walked from the very beginning. The path of the strong is one of solitude. Indifference, ruthlessness, deception, patience… If any of these can serve as shortcuts to strength, he will take them without hesitation! •. •. YO! Tetsuya (MC) doesn’t focus only on Poison-types, he has several others. It’s just that in the "previous timeline", that was his specialty and he became skilled at it. Any normal person would start with what they’re good at and then expand into other paths (Types). — Description from novelcodex.org