Quick question from someone wanting to get back into pokemon games
Im aware that in the progression from R/B/Y to B/W there was gaps in which you could not trade your pokemon up to the next generation.
After Gen I and II (Red/Blue/Yellow and Silver/Gold respectively), the data structure of the Pokémon themselves were redesigned, making migrating Pokémon from gens I and II to later gens impossible. However, both gens received remakes in the form of FireRed/LeafGreen and HeartGold/SoulSilver. These remakes are much superior to the originals, too.
Which game should i start with if i want to have all 646 pokemon in the B/W generation caught legitimately?
Start with? Honestly, Black and White. They're designed for both the new and the "returning to the series after a long hiatus" fan. First Pokémon game I played since the originals, and I loved every moment.
Read my post here where I summarise my recommendations to 'old-new' players more fully. Now that I am sure I love Pokémon again, I intend to pick up SoulSilver. Not so sure I want to go back any further than that. To get every Pokémon, outside of trades you probably need every game released on the GBA onwards. I wouldn't worry about it - rare Pokémon eventually show up again in later entries, so if you start with B/W, you could work towards a complete Pokedex in future games, you dig?
Also, the games differentiate between region-specific Pokedexes and 'National' Pokedexes. To 'complete' the B/W Pokedex, you only need to get the 150-odd
new Pokémon. It's a much more sane and manageable goal. Once you beat the game the National Pokedex opens up, but trying to complete it is probably more trouble than it's worth currently. Just do as much as you can and wait for future installments. You'll get there
eventually over the coming years.
Iv heard about event pokemon and "fateful encounter" pokemon but im not 100% sure on what these are, are the obtainable by other means since iv missed out on the events
Do you have a flashcart (and access to a second DS)? There were usually two ways to get the events - either by download from the Nintendo WFC or by a direct download at a location, where a company employee would be given a special DS cart with the sole purpose of transmitting the data to other DSs, thus unlocking the events in player's carts. As both methods ran for a limited time, you've long-missed the events officially.
However, the carts that are used to distribute the event Pokémon to players at Gamestops, Toys 'R' Us etc. are usually dumped and made available if you know where to look. As an example, there was an event during the launch months of B/W that let you obtain an item that granted access to an island where you could catch Victini, one of the legendaries. Though that event is long over, you can find the cart used to transmit the item, boot it on another DS using a flashcart and use it
just like was done officially. 100% hack-free. Anybody who kicks up a stink about you doing that is a giant dick.