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There are hundreds and hundreds of edits made to the main space every day. Most of them aren't conflicting, everyone humming along and improving Bulbapedia at their own pace. Sometimes, however, users come into conflict over specific phrases, pictures, templates, or other aspects of the Wiki.
If you disagree with someone stylistically--for instance, if you think a template or picture is wrong, or a bad choice, talk to the creator or post on that template's talk page before making changes. Be nice about it--point out the specific deficiencies, and why your idea provides a more effective solution. Don't degrade their work--remember, they worked hard on it. Remember, too, that ideas have inertia, and it may take someone a little while to leave their design and come around to yours. Be patient, understanding, and, again, kind when dealing with another user. It may slow the process of change down a little bit, but the changes will be more pleasant to everyone.
===Writing on talk pages in four words===
Not nice, don't say.
If someone starts trouble on your talk page, don't respond in kind. Let it slide, or, if you have to respond, respond nicely. If it's really bad, contact an administrator--administrators are here to help. If it's an administrator, causing the problem or you don't feel comfortable talking to any of the admins, contact [[User:TTEchidna|TTEchidna]], the current Editor-in-Chief. If you don't feel comfortable talking to him for some reason, or need outside perspective, [[User:evkl|evkl]] or [[User:Archaic|Archaic]] are both available to field issues.
===Other aspects of the
Subpages are cool, as are userpages. Almost all of us have them. But don't use them to bash people, or create lists of disliked people. It would also help if there were no lists of people you liked especially, either; that can cause an atmosphere which encourages cliques, and that's bad. If there are people whom you're working on a project with--for instance, Project Dex--and you want to thank them or give them credit somehow or somewhere, that's fine. But an "A-list" of sorts, that describes your 'best buddies,' can lead to rising tensions, and has few positive consequences.
This does not apply to affiliations or statements of solidarity made with userboxes, or anything of that sort.
There are a handful of long-running feuds between some users. Kiss and make up. Bury the hatchet. Drain the bad blood. It would be a really great thing if every user who knew they had someone they really didn't get along with extended their hand--metaphorically--and apologized for wronging the other.
Play nice, please.