Thanks for the replies so far. The following is a list of event pokemon only based off the Obtainable Pokemon Chart for others who might find it of use. Unsure of its accuracy:
*=Event but either evolution or pre-evolution are able to be caught in the wild/repeatable event. ^=Chosen Starter. &=An Evolution or Pre-Evolution is avalibe for yet another event.
Squirtle; Jigglypuff*; Abra; Ghastly; Lickitung; Magikarp; Lapras; Ditto; Eevee; Aerodactyl; Chickorita; Cyndaquil; Totadile; Togepi; Misdrevious; Sneasil; Smoochum; Elekid; Magby; Lavitar; Treecko; Torchic^; Mudkip; Lotad*; Ralts; Whismur&; Loudred&; Trapinch*; Lunatone; Solrock; Castform; Bygon; Bedlam; Turtwig; Chimchar; Piplup; Kriketot; Glameow; Gible; Munchlax; Riolu; Croagunk; Rotom; Tepig; Oshawott; Lilipup; Roggenrola*; Scraggy*; Zorua; Gothita; Solosis; Tynamo; Litwick; Axew; Deino; Larvesta; Chespin; Fennekin; Froakie; Honedge; Helioptile; Goomy; Klefki; Rowlet; Litten; Popplio; Bounsweet; Type: Null; Mimikyu; Jangmo-o; Poipole.