If you find a founder who will give you a "anti-dillution" condition, run as fast as possible. This is not someone you want to work with. The company will be un-fundable.
Let's say you get 30% of a company and a "no dilution" provision. You build a product. The company is still worth nothing. So you own 30% of zero, which is zero. Things go well, and the company gets some traction. Great! Now it's is worth something. How much? You are about to find out as you close a seed round.
You raise $1 million at a $3 million valuation. Now the company has two things: cash and potential.
At this point, how much of that cash is rightfully yours? $300k or $210K? In effect you have just been granted a $90,000 windfall at the expense of your co-founders and your new investor. That is no fair, and it will never happen, because no sensible investor will accept those terms.