Technically no, but they do prefer you have one
If you're under 23 and can get on a 135 shop, not a bad place to get your footing down, then when you get your license at 23, leave them for 121 experience
Heard there's a lot of busy work that is more customer service related than it is dispatch related which a majority of dispatchers cba wasting their time and sanity with
If you like that sort of work, go for it but from my knowledge, they don't pay very high for long term commitment and can't think of a 135 shop where they are unionized, so good luck negotiating for better pay and benefits