Are the bulus prevalent only in poke showdown? Or will i be facing bulus and kartanas and magearnas in every single game on cartridge?
By this I'm assuming you mean tapus, and by extension magearna and kartana. All are used quite commonly in OU, as well as other formats which are foreign to usual smogon tiering, such as VGC, Battlespot and so on. Note that mythical pokemon such as magearna(though none of the tapus nor Ultra Beasts) are banned from VGC, and by extension Battle Spot. You can find the rules for VGC 2018 as well as the rules for Battle Spot
here and
here. I will also link the
smogon usage stats, as well as the
current thread for the usage based tier updates, as these are an index of usage for each tier/format you wish to seek, which will give you the ability to find how often a pokemon is usually used in a specific tier, as well as the movesets/ev spreads and teammates of these pokemon. Note that these usage stats are usually updated a few days after the start of each month, and reflects the last month's usage.
I personally can't speak from cartridge play but obviously since most of the UBs and all of the tapus are in general very good pokemon you're bound to see them quite often.
Would i be able to make a competitive team around mega char x without tapus, toxa, and any of the ultra beasts? Obviously no mew etc since they are super hard to come by.
Many huge staples in the current metagame are either legendaries, tapus, Ultra Beasts or toxapex as you mentioned, so more than likely you won't be able to create a good team. It is generally frowned upon by the community(or at least isn't supported) to restrict your teambuilding by barring yourself off the usage of legendaries, tapus etc. as again, most staples in the current metagame are one of the aforementioned legenadries/tapus/UBs. Your best bet is to try finding QR codes of teams which have Mega-Zard-X and use those teams if you plan to play on cartridge, or possibly gen these pokemon if you have the means to. If not, you can try the
wifi room in the hopes of asking for some already bred pokemon, although they will not be able to assist you with genning pokemon, as PS! in general does not allow hacking discussion. You can always play on PS!, or rather
play.pokemonshowdown.com, which is the main server in which people will find battles and ladder.
Also. How does competitive battling work online? You choose a battlle and it connects you? Are there tiers?
As already stated, play.pokemonshowdown.com is the main website in which users will find battles and/or chat in several chat rooms. Here is the link to
The Beginner's Guide to Pokemon Showdown!, which should answer all your questions in regards to how online battling works.
To put simply, Smogon is a separate entity from the main pokemon company, meaning that the Pokemon Company does not directly abide by smogon's tiering system, and it has its own other formats such as VGC and Battle Spot. Smogon however has its own tiering system, which you are NOT forced to abide by, but generally is played by more users. You can check out the subforums for all of smogon's main metagames
here, as well as the subforum for all of the cartridge formats
here. Since this is the OU forum, I will link some of the main threads which will be able to give you a better understanding towards the tier.
OU Forums Rules
Sample Teams Thread
VR Thread as well as the
Sets VR Thread
Speed Tiers
Cores Thread
Role Compedium
Underrated/Creative Sets
PDC gives good pokemon advice thread
There is also the
tiering policy framework thread which goes into depth on tiering policy, as well as the
tiering FAQ which goes in depth on how/why tiering works.
And if anyone has charx teams to link that would be cool. I can't find many so i dont have a great idea of who to team him with :C
You can check the Samples Teams thread linked above for future updates that could incorporate Zard-X teams, but as of right now, there aren't any in there. You can also check out the teambuiding workshop for OU
here, where you can request for a team to be built around Zard-X, although the builders will not bar themselves off from using any UBs/Legends/Tapus. There is also a team with Zard-X which I will link
here, which also incorporates Specs Tapu Koko and other pokemon. You can also check the official smogon analysis for Mega-Charizard-X
here, which should detail what pokemon best pair with it, along with its checks and counters.
This should cover all of your questions, but feel free to ask more in this thread, on the
official discord for OU, or even in the
Overused Room on PS!