A Fusion Monster can never be Normal Summoned, as it is impossible to put them in your hand. A Fusion Monster must be Special Summoned, be it Fusion Summon through Polymerization or similar, or a regular Special Summon by any card that can do it.
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For Polymerization, the Fusion Components/ Fusion Material Monsters can either be in your hand or on the field, or a combination of both.
No, cards like 'Polymerization', 'Future Fusion', and 'Fusion Gate' cannot be used to summon any of the XYZ Fusion Monsters. These Fusion Monsters cannot be Fusion Summoned and requires you to banish the monsters listed on the Fusion Monster from your side of the field in order to Special Summon them.
Fusion Monsters that are summoned without using Polymerization (and similar) cannot be summoned via Future Fusion, meaning you can't select them for Future Fusion in the first place. Other monsters that this applies to are Gladiator Beast Heraklinos, Armityle the Chaos Phantom, and the Neos fusions such as Elemental HERO Dark Neos.
A Fusion Summon generally consists of two or more Fusion Material Monsters and the Spell Card Polymerization.Some Fusion Summons, such as Contact Fusion, do not require the use of Polymerization and can be fused as directed on the Fusion Monster.
Dark Paladin and Dark Flare Knight both list Dark Magician as a Fusion Material monster.