Number 99 in that TV Asahi chart I mentioned yesterday. And another show I've not actually seen. However from the anime shows I've actually seen and what I know of Yatterman (and the Time Bokan series of shows that it comes from), I shall declare it (and the others in the series) as being influential.
“Influential?” you ask. Yes, influential. In part ir's because of it being a successful series of shows joined by theme but not actual continuity (something Sunrise would exploit with Gundam and the Yuusha series in the nineties).
But mainly because of it having teams of comedy villains who tend to be composed of an attractive female and two goofballs.
This can be found referenced/homaged in shows such as Nadia: Secret of Blue Water, Flint The Time Detective (which is packed with Time Bokan influences), the Ragnarok Online anime and most famously in Pokemon's Team Rocket.
Oh yeah, Excel Saga watchers may also recognise the design of the mecha in these credits…
Tatsunoko Pro's English Description of the show.
Montage of clips from the show itself