The Question and Answers here contain some confusion and misinformation.
The bistable latching relay retains its state even after power to the coil is removed. This gives it an advantage in efficiency over conventional relays since the coil need not be powered beyond the few milliseconds required to reach the desired state. This bi-stable operation can make the latching relay more efficient even than solid-state alternatives. It has two stable states, whereas a conventional relay always falls back to its un-powered state (NO or NC) when coil power is removed.
AFAIK, "Rated Coil Power" is not an industry standard term, nor even widely used by latching relay manufacturers. In fact, it's not even defined in the data sheet for the subject latching relay. However, it may be inferred that this is the manufacturer's attempt to communicate the worst-case drive current required to ensure the relay contacts are driven to their specified state.
This brings up another interesting point: Selecting a relay with the lowest-rated coil voltage leads to the challenge of sourcing the highest-rated coil current! The OP's question is sadly lacking in details, but the coil current required could have been significantly reduced by using a part with a higher coil voltage rating. Also, in general, it's never a good idea to drive an inductive load from a GPIO.
In one sense, the question asked here is useful for illustrating how NOT to design a latching relay interface. Higher coil voltages yield lower current requirements, and generally simplify the design.
There are several sound approaches to designing an interface to drive relay coils from a Raspberry Pi GPIO. The simplest and most reliable for many low-powered relays utilize the simple bipolar transistor as a low-side switch - as shown in the schematic below.
Bipolar transistors are ideal for interfacing RPi's GPIO pins to external loads. A bipolar transistor is driven by base current, but even at 3.3V, GPIO pins can easily source enough current to drive small signal transistors such as the 2N3904 or 2N2222A into saturation. Some may suggest that a MOSFET transistor be used, but they can't justify the added complexity and/or reduced performance of a device that may require 7-10 volts of gate drive, or cost much more than a bipolar.
simulate this circuit – Schematic created using CircuitLab