Check your season. Bugs normally don't prosper in winter.
You don't get to glitch city. It's not real
there really isn't glitch city but if you put in a specific cheat of something, maybe you might come across glitch city. WARNING: glitch city may not have a Pokemon center due to the glitches...
No, you can't.
You do not find missingno in glitch city on pokefarm. you get missingno in the saftey matters quest.
You can find this information on bulbapedia, but some well known ones are Glitch City, Mew Glitch, Missingno. Glitch, and there are limitless glitch pokemon.
The legimitate way is to download the GS Ball from a Nintendo Promotion Event and send it to Gold from Crystal, then place it in the shrine in Ilex Forest. There is also a glitch found by Paco_81 in Glitch City Laboratories. Check Glitch City for the glitch.
the power forest
They disaper in late fall to spring just like in the real world but if you hit the large rocks you find around the neighborhood with a shovel some worms and bugs that hibernate may come out (also money) from my personal experience I have found rocks with money closer to the shore and rocks with bugs closer to civilization.
cinabar island
Disappeared - 2009 City of Angels 6-6 was released on: USA: 24 December 2012
Yes, it is north of Ilex Forest or south of Goldenrod City.