There are a few ways to connect to the PokemonCrater chat without going to the website.
Here is a list of some:
Lucidchat's Java Applet
The first way is by using the applet on Lucidchat's website. This is the easiest way to connect to the Pokemon Crater chat on the list. To connect using the applet on Lucidchat's site, follow the directions below.
mIRC
The second way is by using a program called mIRC. Although this way may be confusing, it is in my opinion, the best way overall to connect. Steps 13-21 are technically optional but I strongly recommend doing them if you're just starting out with mIRC. They are a couple steps that really help in the beginning. To connect using mIRC, follow the directions below.
For your Full Name, Just make anything up. It doesn't have to be your full name.
For Email Address, again, just make something up. It doesn't have to be your real email address.
For Nickname, you put your main nickname.
For Alternative, you put an alternative nickname that you use.
When you've filled it out, look on the left at the list. You'll see that "Connect" is selected. That is what you are in right now. You need to click the "Servers" category under "Connect".
Under Description put in LucidChat.
Under IRC Server, put in the actual server address. In this case, it is irc.lucidchat.net
Leave the categories Ports, Group, and Password alone.
Finally, click "Add".
Now, look back on the left and click the plus sign next to "IRC". A few other categories should come up under it. Click "Messages"
In the Channel box, put in the name of the channel you want to automatically join. unless you own the channel, leave Password blank. Also leave Description blank.
Check the box under Options that says "Join on connect". Then, click "OK".
After you click it, the Scripts Editor will open. Make sure that you select the Aliases tab. If you look in the picture, I wrote "f1 /nick Incorrect". This means that when I click the f1 key, mirc will automatically type out "/nick Incorrect" for me. This is one of the many shortcuts Scripts can have.
I also put in a fake password with "/ns identify password". You can add whatever you want here. I only added this so that it would be very simple for you to switch to your nickname and then quickly identify to it by clicking only two keys on your keyboard.
When you're finished, click "OK".
Other Applets
The last way just includes using other applets. The only one I'm going to discuss is the one on www.IrcAtWork.com.
I hope this helps you. Good luck!