PokéBase - Pokémon Q&A
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Two possiblities... It's not at the proper level (39 and above) or your pressing b when it starts evolving
Here's info on tynamo

It could also be a glitch
its level 40 when does it evolve again
Level it up to level 41. After tge battle where it levels up, It will begin to evolve. A t this time, DON'T TOUCH ANYTHING and after some animation you should receive the message "congratulations your tynamo has evolved into a eelektrik!" You will then have yourself an eelwktrik, which you may evolve at any time you wish with a thunderstone.